We report, for the first time to our knowledge, comparisons of light-scattering computations for large, randomly oriented, moderately absorbing spheroids based on the geometric-optics approximation and the exact T-matrix method. We show that in most cases the geometric-optics approximation is (much) more accurate for spheroids than for surface-equivalent spheres and can be used in phase function computations (but not in polarization computations) for nonspherical particles with size parameters as small as 60. Differences in the single-scattering albedo between geometric-optics and T-matrix results are surprisingly small, even for small size parameters.
© 1995 Optical Society of America
Original Manuscript: May 26, 1995
Published: October 1, 1995
Andreas Macke, Michael I. Mishchenko, Karri Muinonen, and Barbara E. Carlson, "Scattering of light by large nonspherical particles: ray-tracing approximation versus T-matrix method," Opt. Lett. 20, 1934-1936 (1995)